渤海地区晚第四纪环境演化与第四纪滨海相地下卤水的形成

Late Quaternary Environmental Evolution in the Bohai Sea Area and Formation of Quaternary Subsurface Brine

由于气候变化和新构造运动,渤海曾发生多次海陆演化,从而形成了第四纪地下卤水。间冰期的海侵提供了形成地下卤水的水源,气候波动产生了海水浓缩的条件,而冰期海退过程中,陆源物质覆盖于海相沉积上,保存了地下卤水。对环境演化在“潮滩生卤”和“冰冻生卤”过程中重要作用的分析结果表明,在第四纪环境演变的过程中,两种生卤作用在地质时期卤水矿床形成中均具有重要意义,并且只要存在海水物源,就有可能形成地下卤水。

Because of climatic changes and new tectonic movements, several sea and land evolutions occurred in the Bohai Sea area to result in the formation of subsurface brine. The sea transgression in the interglacial periods provided the water source for formating the subsurface brine, the climatic fluctuations created the conditions for seawater concentration, and the sea regression in the glacial periods made the terrigenous meterial cover the marine deposites so as to conserve the subsurface brines. It is shown from the analysis results that the brines formed by seawater freezing and the brines formed by seawater evaporation on coastal beach all have important implication for the formation of brine deposits in the quaternary environmental evolution process, and the subsurface brines could be formed provided that the seawater sources existed.